Fairfax BRT Auto Skims Analysis

Summarizing STOPS Output Zone-to-Zone Skims by Distirct

This document reviews an analysis that generates district-to-district auto distance and auto time values from STOPS model zone-to-zone skim outputs.

Analysis

Step 1: Read in district-zone relationship table

In this step the attribute table from the AC_DistrictZone.shp file located in the STOPS Districts directory is imported in order to match zones in the skims to districts.

Map of districts

Step 2: Read in skims

In this step all zone-to-zone .bin skim files are read in from the STOPS OutputData folder. Different files represent different years and scenarios.

List of skim files in folder

Skim Files AC_FC_40-WMATA_40-VRE_40_Zone2ZoneBLD-.bin AC_FC_40-WMATA_40-VRE_40_Zone2ZoneY2040BLD-.bin AC_FC-WMATA-VRE_Zone2ZoneEXST.bin AC_FC-WMATA-VRE_Zone2ZoneNOBL.bin AC_FC-WMATA-VRE_Zone2ZoneY2017EXST.bin AC_FC-WMATA-VRE_Zone2ZoneY2040NOBL.bin AC_FC_40-WMATA_40-VRE_40_Zone2ZoneY2017BLD-.bin AC_FC-WMATA-VRE_Zone2ZoneBLD-.bin AC_FC-WMATA-VRE_Zone2ZoneY2017BLD-.bin AC_FC-WMATA-VRE_Zone2ZoneY2017NOBL.bin

Step 3: Join districts to zones

In this step district names are joined to each skim file using the district-skim relationship table. After districts are joined to each feed, a check is run and any zones without a matching district are listed in the tables below.

A Zones missing A District in AC_FC_40-WMATA_40-VRE_40_Zone2ZoneBLD-.bin :

All Zones Matched With District

P Zones missing P District in AC_FC_40-WMATA_40-VRE_40_Zone2ZoneBLD-.bin :

All Zones Matched With District

A Zones missing A District in AC_FC_40-WMATA_40-VRE_40_Zone2ZoneY2040BLD-.bin :

All Zones Matched With District

P Zones missing P District in AC_FC_40-WMATA_40-VRE_40_Zone2ZoneY2040BLD-.bin :

All Zones Matched With District

A Zones missing A District in AC_FC-WMATA-VRE_Zone2ZoneEXST.bin :

All Zones Matched With District

P Zones missing P District in AC_FC-WMATA-VRE_Zone2ZoneEXST.bin :

All Zones Matched With District

A Zones missing A District in AC_FC-WMATA-VRE_Zone2ZoneNOBL.bin :

All Zones Matched With District

P Zones missing P District in AC_FC-WMATA-VRE_Zone2ZoneNOBL.bin :

All Zones Matched With District

A Zones missing A District in AC_FC-WMATA-VRE_Zone2ZoneY2017EXST.bin :

All Zones Matched With District

P Zones missing P District in AC_FC-WMATA-VRE_Zone2ZoneY2017EXST.bin :

All Zones Matched With District

A Zones missing A District in AC_FC-WMATA-VRE_Zone2ZoneY2040NOBL.bin :

All Zones Matched With District

P Zones missing P District in AC_FC-WMATA-VRE_Zone2ZoneY2040NOBL.bin :

All Zones Matched With District

A Zones missing A District in AC_FC_40-WMATA_40-VRE_40_Zone2ZoneY2017BLD-.bin :

51059003839

P Zones missing P District in AC_FC_40-WMATA_40-VRE_40_Zone2ZoneY2017BLD-.bin :

51059003839

A Zones missing A District in AC_FC-WMATA-VRE_Zone2ZoneBLD-.bin :

51059003839

P Zones missing P District in AC_FC-WMATA-VRE_Zone2ZoneBLD-.bin :

51059003839

A Zones missing A District in AC_FC-WMATA-VRE_Zone2ZoneY2017BLD-.bin :

51059003839

P Zones missing P District in AC_FC-WMATA-VRE_Zone2ZoneY2017BLD-.bin :

51059003839

A Zones missing A District in AC_FC-WMATA-VRE_Zone2ZoneY2017NOBL.bin :

51059003839

P Zones missing P District in AC_FC-WMATA-VRE_Zone2ZoneY2017NOBL.bin :

51059003839

Step 4: Map zone-to-zone distances and times

Auto distance to Pentagon Zone 51013000274 for all skims

Auto time to Pentagon Zone 51013000274 for all skims

Auto distance from Hybla Valley 51510000036 for all skims

Auto time from Hybla Valley 51510000036 for all skims

Step 5: Summarize to district

In this analysis step each skim table is grouped by unique district-to-district combinations. Each group is comprised of all the zone-to-zone rows in each district pair. In each group, mean value of all the time and distance values is computed. The results below show the distilled

District-to-district summarized results

The following tables present the final summarized results. These tables enable side-by-side comparisons between the various skim inputs of the mean distance and time values for each district-to-district pair.

Times

This table shows the mean value of zone-to-zone distance value for each district-to-district pair.

Distances

This table shows the mean value of zone-to-zone time value for each district-to-district pair.